Extended /Streched RAC :: V$ ASM view /crsctl queries hang with NFS unavailable (Doc ID 1957814.1)

Last updated on SEPTEMBER 21, 2015

Applies to:

Oracle Database - Enterprise Edition - Version 10.1.0.2 and later
Information in this document applies to any platform.

Symptoms

 

Extended RAC using a third voting disk on NFS ( normal redundancy diskgroup ).
When the NFS server is unavailable, the database works fine but the clusterware ( crsctl stat res or queries on v$asm views ) hangs.


+ Database was operating properly
.
+ dd on NFS device hangs and completes successfully when NFS comes back .
.
+ v$asm views are hanging as kfod itself is hanging.
.
From pstack of kfod command ,
.


ffffffff7e9dc1c0 cond_wait_queue (100ed2650, 1011a4350, ffffffff7bbfb900,
418937, 0, 0) + 4c
ffffffff7e9dc69c cond_wait_common (100ed2650, 1011a4350, ffffffff7bbfb900,
2946, 0, 0) + 28c
ffffffff7e9dc86c __cond_timedwait (100ed2650, 1011a4350, ffffffff7bbfba78,
0, ffffffff7bbfb900, 0) + 60
ffffffff7e9dc930 cond_timedwait (100ed2650, 1011a4350, ffffffff7bbfba78,
900b, 127, fffffffffff0bdc0) + 14
ffffffff73582710 sltspctimewait (83126e0, 101271dc0, 101271da8, 418937,
418937, 43e2c) + f0
ffffffff76aa883c clsucvtimewait (1003a7f10, 101271dc0, 101271da8, ffffffff,
0, ffffffff7eb7e000) + 34
000000010012d410 clssscWaitChangeEventValue (101271c50, 100490010,
101271da0, 1, ffffffff, fffc00) + f0
0000000100149d94 clssbnmWaitChangeMsgState (101271d68, 1, ffffffff, 4,
25c294, 0) + 64
000000010010d7ec clssbnmcThread (101271c50, 1004918a8, 1003c7c50, 1,
1004918a8, 101271c50) + cc
0000000100127984 clssscthrdmain (101271c50, 0, 0, 1001277d0, 0, 1) + 1b4
ffffffff7e9e26ec _lwp_start (0, 0, 0, 0, 0, 0)

Cause

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